had a role in their deaths. Next to syria and a humanitarian nightmare for a city under siege there. Aleppo is the largest city in the country with more than 2 million people. Now subjected to relentless assault by the government. Dozens of men, women and children have been killed. Terry moran has the latest on that. Reporter: They are scenes out of hell -- the hell that the city of aleppo has become. In one of the worst attacks in this horrific war, government helicopters dropped "barrel bombs," large containers filled with explosives, shrapnel and incendiary materials on several civilian neighborhoods throughout the city over the last three days. At least 76 people have been killed, including 28 children, according to the international aid workers on the scene. The wounded have overwhelmed aleppo's hospitals. A leader of the doctors without borders team in syria spoke with us late today -- it's literally impossible to take care of everything. This is clearly targeting concentrations of civilian. Reporter: Aleppo, once considered one of the most beautiful cities in the middle east is in ruins and those left here are after more than two years of grinding war are trapped. On one side, the ruthless government forces of president bashar al assad, determined to smash all oppositions to his rule. On the other, rebel forces now dominated by extreme jihadists secretary of state, john kerry said today he still believes peace talks can be held next month in geneva, part of the long -- and so far failed effort by the u.S. To do something, anything, to stop this carnage. Terry moran, abc news.

This transcript has been automatically generated and may not be 100% accurate.

'This Week': John Kerry on Syria and Afghanistan

ABC's Martha Raddatz goes one-on-one with Secretary of State John Kerry from Vietnam.

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